Simplified flight control system for diverse vertical takeoff and landing aircraft

Background

The rapidly expanding field of Urban and Advanced Air Mobility (UAM/AAM) relies heavily on the deployment of Vertical Takeoff and Landing (VTOL) aircraft to enable efficient point-to-point transportation. As the industry scales, a wide variety of novel aircraft configurations—such as lift-plus-cruise, tilt-wing, and vectored thrust designs—are being developed concurrently. To safely and economically integrate these high volumes of diverse aircraft into the airspace, the industry is shifting toward the Simplified Vehicle Operations (SVO) paradigm. This operational concept aims to reduce cognitive workload and allow operators to seamlessly transition between different aircraft types with minimal type-specific retraining, creating a pressing need for standardized pilot interfaces and consistent handling qualities across the entire VTOL fleet.

However, current flight control approaches struggle to achieve this operational standardization due to the fundamentally different aerodynamic and propulsive characteristics of various VTOL platforms. Each configuration utilizes distinct effectors, such as fixed-pitch lift rotors, tilting wings, tailfans, and conventional control surfaces, which behave differently across vertical, transition, and forward flight regimes. Traditional flight control systems are bespoke, custom-engineered to manage the complex, coupled dynamics and unique control allocation requirements of a single airframe. Consequently, pilot inputs yield vastly different vehicle responses depending on the specific aircraft and flight mode, requiring extensive, vehicle-specific pilot training and hindering the widespread adoption of simplified operations.

Technology

The technology is a standardized Flight Control System (FCS) designed for Simplified Vehicle Operations (SVO) across diverse Vertical Takeoff and Landing (VTOL) aircraft configurations. The system integrates five core components: normalized pilot inceptors, flight-mode-dependent command mapping, a Trajectory Control System (TCS), Explicit Model Following (EMF) inner-loop controllers, and configuration-specific control allocation. Operating seamlessly across vertical, hybrid, transition, and forward flight modes, the TCS manages longitudinal trajectories by regulating thrust, attitude, and vehicle configuration through proportional-integral control. Simultaneously, the EMF inner loops utilize feed-forward and feedback paths to generate normalized roll, pitch, and yaw commands, which are subsequently translated by the control allocation logic into precise adjustments for an aircraft’s specific effectors, such as propulsors and aerodynamic control surfaces.

This technology is differentiated by its ability to deliver a unified pilot interface and consistent aircraft response across fundamentally different VTOL architectures—including Lift-Plus-Cruise, Tilt-Wing, and Vectored Thrust designs—without sacrificing vehicle-specific performance. By decoupling the standardized pilot command architecture from the customized control allocation logic, the system enables pilots to transition between disparate aircraft types with minimal retraining. Furthermore, the system employs a systematic Genetic Algorithm (GA) optimization process across four distinct control levels. This automated tuning minimizes actuator usage while strictly enforcing stability, damping, and margin constraints, rapidly aligning actual vehicle performance with desired response models in just a few hours.

Benefits

• Standardizes pilot interfaces and aircraft responses across fundamentally different VTOL configurations
• Minimizes pilot retraining requirements when transitioning between different aircraft types
• Simplifies vehicle operations for Urban and Advanced Air Mobility environments
• Provides smooth and automated transitions across vertical, hybrid, transition, and forward flight modes
• Maintains vehicle-specific performance optimization while utilizing a unified control architecture
• Reduces actuator wear and usage through genetic algorithm-based control gain optimization
• Facilitates scalable adaptation to new VTOL aircraft designs via a modular control framework
• Ensures stable and consistent flight handling qualities even in turbulent conditions

Applications

• Urban air mobility air taxis
• eVTOL pilot training simulators
• Multi-type VTOL fleet operations
• Simplified personal air vehicles
• Remotely piloted cargo VTOLs

Additional info

This standardized flight control system for diverse VTOL aircraft integrates a Trajectory Control System with Explicit Model Following inner loops. It translates normalized pilot inputs across multiple flight modes into longitudinal trajectory, thrust, and attitude commands. Utilizing feed-forward Lower Order Equivalent Systems and PID feedback, the architecture generates normalized rotational efforts. Configuration-specific control allocation and multi-level genetic algorithm optimization ensure uniform handling qualities across disparate vehicle configurations.